var browser=navigator.appName 
var b_version=navigator.appVersion 
var version=b_version.split(";"); 
var trim_Version=version[1].replace(/[ ]/g,"");  
if(browser=="Microsoft Internet Explorer" && trim_Version=="MSIE8.0") 
{ 
document.querySelector('.layer-nosupport').className = "layer-nosupport on";
} 
else{ 
document.querySelector('.layer-nosupport').className = "layer-nosupport";
}